Spindle bearings for machine tools



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ll'ntented Ferla, 23, 1932 lllNlllEll STATES PATENT FFltllll wwommmmmwmwm "WILLM POTTER, OF PAWTUCKET, RHODE ISLAM 1W lfllllllllfl'lillll .'BEBINGS EUR :MACHINE TOOLS .Application filed Detener 14, 1927. Serial No. 226.247.

l ot the cutting tool on the Work in the chuck,

end thus eliminate chattering. An important toeter in the problem presented lor solution is the lintifrietion hearings, and n leoture ol inv invention is the nietter ot" the entilrio tion hearing construction.

lilly intention consists in Whatever is described losY or is included within the terms or scope el the appended claims.

the drawings:

l is s top plan View oli the head steelt or averli spindle portion ol o machine tool embodying my invention, the hrace-forn1 ine' cover inenioer being removed;

lig. 2 is s vertical longitudinal section through the spindle axis with the hrece-eover in posit-ion;

lllip): 3 is n eross section on the line fil-3 et lig. 2.

lll/That is shown in the drawings is an ein liodiinent ot in v invention in n machine tool nl' the automatic turret type, although only the headstoclr portion ot the machine is ehon'n, since it is with that portion of the rnnehine that inv invention is concerned. T he lierulstoelr, l0, is a casting mounted on the top oitD the hase traine, ll, and the hesdstoelr ineludes tivo vertical arms, l2, spaced apart something less than the length ot the chuck eorryingr spindle, 13, end providing neer each end olf the spindle u hearing theret'or. Each heerinp,I is nn enti-frietion hearing: and each is n single ro'tv roller loesring, lei, the rollers heineV tapering ond the smuller ends ot' the rollers ot the tvvo Vrows being! opposite one enother1 and each roller hearing is secured in place Within the openingr provided therefor in the respective arm., l2, hy ineens ot screw rings or nuts, l5. the tivo nuts or rings when serevved to position moved towards one nnother, nnd thus the hearings are placed in eoinpression andthe spindle, 13, placed under lateral constraint, ond by thrusting open the arms, 12, tending to press them towards one another. The outer race ot the roller heer inps in each case 1s in o recess or opening that has :in inwardly projecting shoulder that is l" engaged by the inner end of seid rece. lle tween the tvvo arms, 12, ahove the spindle is placed a plete, 16, which constitutes el brace :tor seid ernis, the inner opposite of which are engaged by flanges, 1 7, on the plate which project downward, and the plete projects over the tops of seid ernis and is secured thereto hv screws or bolts, 18. lt will he seen that :trom the conjoint elleet oli the Compression in the spindle and the lorseinp,I

action ol' the plate, lo, the spindle is supported in its hearings with very great rigidity Aand movements of the headstoclr portion `which supports the spindle end which would result in clintterings are stoutly opposed.

At one side of the spindle the two vertical arms, 12, ere tied together by a, web, 19, integral therewith, and thus a further element oi stillness or rigidity is imparted to the spindle-su'iporting structure, and another element ot strength is imparted :it the opposite side of the spindle by on integral intei-ns1 jog, 20, which extends parallel with. the Welo, 19, and .from which outwardly en tends e web, 2l, parallel with a. web, 225, thot extends troni the other vertical arm, l2, these Webs 2l and 22, providing; hearings or supports for slia'lts of the inneliine which ente' parallel with the spindle, and which 'for sti ness and strength should have their hearings as close together es possible, and that eondition is secured by the inward jog, 20. lt will he seen that in plein View :is shown in ling. l., the hendstoclr substantially ll-'shope The plate, 16, constitutes e eover ."for the opening in the top of the hendstoclr lying between the Wells, 19,21 and 22.

A feature oi my invention is the single rovi roller hearing l'or the spindle, which in itsei is a desirable torni ot' nntilriction herding',

VVhst l clsiin is:

l. A machine tool having e vvorlnspindle, e headstoek having spaced eport :irnos with anti-friction hearings t'or the spindle, ineens to place the hearings in compression on. the

ll (l spindle and exert inward pressure upon said arms, and a. brace interposed between said arms.

2. A machine tool having a work-spindle, 5 a headstock having spaced apart arms with anti-friction bearings for the spindle, means to place the bearings in compression on the spindle and exert inward pressure upon said arms, and a brace interposed between said l@ arms, comprising a plate having flanges projecting between the arms and engaging them. 3. A machine tool having a worl -spindle, a headstock having spaced apart arms with anti-friction bearings for the spindle, means to place the bearings in compression on the spindle and exert inward pressure upon said arms, a. brace interposed between said arms, and a tie between said arms integra-l therewith.

4. A machine tool having a work-spindle, a headstoek having spaced apart arms with anti-friction bearings for the spindle, means to place the bearings in compression on the spindle and exert inward pressure upon said arms, a brace interposed between said arms, a tie between said arms integral therewith, at one side of the spindle, a jog extending inwardly from the opposite side of one of said arms integral with the arm and from which ext-ends a web at right angles to the spindle, and a similar web extending from the other. arm.

5. A machine tooi having a work-spindle` a headsteck having spaced apart arms with single row roller anti-friction bearings for the spindle, means to place the bearings in compression on the spindle and exert inward pressure upon said arms, and a brace interposed between said arms.

6. A machine tool having a work spindle, separated bearings therefor, each bearing containing single row roller anti-friction bearings, the rollers being tapering, and the smaller ends of the rollers of the two rows being opposite.

En testimony whereof I hereunto aix my signature.

WLLAM WALLACE POTTER. 

